Kaoru, a friend from the piano class Ruli once attended, has gone missing. While searching for her, Ruli and the gang find a strange dent and her shoes. And as they continue their search, Hiro is suddenly asked a mysterious riddle.
GO AFTER, VANISH, SHOW UP
kurikaeshite wa tsukamenai
Go after, vanish, show up! Wir werden es niemals
erreichen, wenn wir nicht mehr dafür tun!
Poursuis-la, elle disparaît, réapparaît
Encore et encore, insaisissable
Vai atrás, some, aparece!
Se continuarmos assim nunca vamos pegá-lo!